He didn't asked my introduction Me: Sir, in academics I like Data Structures and algorithms Interviewer: Ok, what is linked list? Me: Answered fluently :p Interviewer: What is doubly linked list? Me: Again, answered Interviewer: Are you comfortable with writing codes? Me: Yes Sir I can try. Interviewer: Suppose we have an array of integers, we want to pull out all the prime numbers from them and print them in descending order? Me: I wrote it in a single shot using prime number having 2 factors and applied bubble sort concept, as it was one of the important and frequently asked problem, basically he wants to test both knowledge of prime numbers checking and sorting.